SP 106 - a simple to use, all-purpose epoxy which can be used for gluing, coating, laminating and filling. With its range of hardeners, and easy 5:1 mix ratio by volume, SP 106 provides a quick and convenient way of using one epoxy system for a very wide range of tasks. You save money by buying more of it in a pack - It stands to reason. That 3Kg is less per Kg than a 1Kg pack. Enjoy!